Guidewire with a variable stiffness distal portion
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United States of America Patent
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Sep 11, 2001
Issued Date -
N/A
app pub date -
Apr 6, 1999
filing date -
Apr 18, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
A guidewire having a core section formed of a NiTi alloy which is in an austenite phase when being manufactured but which is converted to the martensite phase at operating (body) temperature (37.degree. C.) and can be transformed to an austenite phase by heating to a temperature above body temperature but below 50.degree. C. When in the austenite phase, the core section is at a high strength level which ensures the tracking of a catheter over the guidewire within a patient's body lumen. In one preferred embodiment the core section is heated by electrical resistance or inductance.
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